(Hey, nice foot, BTW)
I've narrowed it down to 3 possibilities...
1)This person is insane
2)This person is a spy and her line is "You owe me a monitor". She's waiting for the counter sign. This is possible because I see her posting it everywhere. BTW, the counter signs are not "What are you talking about?""Who are you?"or,"Stop following me!"
3)She likes to eat/drink while reading posts and sometimes certain posts make the milk come out her nose.